Poppet valve assembly



Jan. 13, 1953 G. L. TEscHER POPPET VALVE ASSEMBLY Filed Dec. 18, 1950 1N VEN TOR Gor'dn. asc e?" ATTORNEY Patented Jan. 13, 1953 UNITED STATES PATENT OFFICE PoPPE'r VALVE ASSEMBLY Gordon L. Tesclier,v Anderson, 11nd., Aassignor to Tescher Corporation, Anderson, Ind.

Application December 18, 1950, Serial No.`'1,2'75- 2 Claims. l

'This invention relates to va new and improved poppet valve assembly designed primarily for use in a fuel pump for a two-cycle internal combustion engine, although not restricted to this eld of use.

The principal object of the invention is to provide a novel valve assembly which will be free- Afloating and self -seating and will `faultlessly vfunction even at high-speed operation.

Another object is to provide a valve assembly which may be easily and inexpensively manufactured, and may be installed and replaced without difiiculty.

A further object is to provide a valve assembly .including a spring arm. for yieldably holding the valve against its seat and a stop arm for limiting valve opening, and to unitarily connect said spring arm with said stop arm to facilitate initial assembly and to prevent possible loss of the spring arm when making repairs or replacements.

A still further object is to form the spring arm in a novel manner facilitating its connection with both the valve and the stop arm.

With the foregoing and other objects in view that will become apparent as the nature of the invention is better understood, the same consists in the novel form, combination and arrangement of parts hereinafter more fully described, shown in the accompanying drawing, and claimed.

In the drawing:

Fig. 1 is a top plan view of a fuel pump embodying two of the valve assemblies and locating them in dotted lines.

Fig. 2 is a top plan view of the central pump casing section and the outlet valve assembly therein.

Fig. 3 is a bottom plan view of the upper pump casing section and the inlet valve assembly therein.

Fig. 4 is a vertical sectional view on line 4 4 of Fig. l, showing portions of both the inlet and outlet valve assemblies partly in transverse section and partly in elevation.

Fig. 5 is a vertical sectional view on line 5-5 of Fig. l, showing the outlet valve assembly in longitudinal section.

Fig. 6 is a perspective view showing one of the valves and the associated spring arm and stop arm.

To facilitate explanation the construction disclosed in the drawing will be rather specifically described, but attention is invited to the possibility of making variations.

The fuel pump casing in which two of the improved valve assemblages have been disclosed, in-

cludes an upper section I0, a `central .section II and a lower section I2 all secured together Aby screws I3. The upper section I0 is formed `in :its

lower side with two chambers If4 and I5, with an inlet I6 and vertical port I1 placing this inlet It in communication with the chamber I4, and with an outlet I8 leading from chamber I`5. The cen- 'tral section II is provided, in its upper side, with one chamber I4 communicating with the chamspectively. A diaphragm 22 closes the lower side of the chamber I9. The lower casing section I2 is provided with a chamber 23 closed at its upper side by the diaphragm 22, and with a passage 24 communicating with said chamber 23. A spring 25 acts downwardly on the diaphragm and reacts against the casing section I I. The passage 24 is to be connected with the crank case of a twocycle internal combustion engine, whereby the plus and minus pressures in said crank case during engine operation will cooperate with the spring 25 to pulsate the diaphragm and produce the desired fuel pumping, with the aid of the valve assemblies hereinafter described in detail.

Two of the valve assemblies are employedan inlet assembly 26 associated with the lower end of the port I1, and an outlet assembly 21 associated with the upper end of the port 2|. The construction of the outlet assembly 21 is fully shown in the drawings and will be specically described. The inlet assembly 26 is a duplicate of the outlet assembly 21 except that it is inverted. At least some of the reference numbers used in describing the assembly 21 will be found also on the assembly 26, plus the exponent a, for identification, and this will obviate a separate description of said assembly 26.

The assembly 21 includes a valve body 28, a stop arm 29 for limiting the opening movement of said valve body 28, and a spring arm 30 for yieldably holding said valve body 28 against its seat. The body 28 is preferably of disk-like form with a fiat lower surf-ace to contact with a fiat seat S on the casing section II. The body 28 is provided with a central upstanding integral stud 3|, and it is by preference formed from Bakelite or the like. The stop arm 29 is a plain strip of metal having its ends offset into different planes. One of these ends is formed with a central opening 32 for the reception of an attaching screw 33 which is driven into the casing section il, and the other end of said arm is in the upward path of the stud 3| as best seen in Fig. 5. The anchored end of the arm 29 is also formed with two smaller openings 34 laterally spaced from the opening 32. The spring arm 30 is formed from a single length of spring wire bent into V-shape and having a coil or eye 35 at its bight, the ends of the wire being passed upwardly through the openings 34 and clinched as shown at 36 in Figs. 2 and 6. The coil or eye 3 5 rather loosely receives the stud 3i of the valvebody 28. There is thus provided an easily manufactured and installed assembly in which the spring arm 30 is unitarily attached to the stop arm 28, in which said stop arm may be bent to adjust the extent of valve opening, and in which said spring arm and stop arm are readily removable for replacing a worn valve body 28 with a new body, the construction also facilitating substitution of an entire new assembly if desired; Tightening of the screw 33 not only attaches the arm 29 rigidly to the casing section l l but clamps the ends of the V-shaped wire arm 30 between said arm 29 and the underlying port of said casing section, and if the latter be of sufficiently soft material,4 said clamped ends will be embedded somewhat therein. The assembly will function with unusual effectiveness even at high speed operation and the valve is of floating and selfseating nature.

therein Without departing from the 'spirit and scope4 of the invention as claimed.

Iclaim:

v l. A valve assembly comprising a valve body to contact with a seat, said body having -a central stud at the side thereof remote from its seatengaging surface, a stop arm having one end disposed in the path of said stud to limit valve opening, the other end of said stop arm having an opening to receive an attaching fastener, said other end of said stop arm also having two laterally spaced relatively small openings, a spring arm comprising a V-shaped length' of spring wire having an eye at its bight receiving said stud, the ends of said wire being extended through said relatively small openings and clinched to c onnect them with said stop arm, said spring arm exerting pressure on said valve body in valve closing direction.

2. A structure as specified in claim 1; the end portions of said spring wire being disposed for clamping against the above mentioned support upon tightening of the fastener passed through the nrst mentioned opening.

GORDON L. TESCHER.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 107,605 Foster Sept. 20, 1870 1,915,490 Gere June 27, 1933 2,285,756 Schweighart June 9, 1942 2,515,425 Restemeiser July 18, 1950 

